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Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Cash and Cash Equivalents, Policy
Cash and Cash Equivalents
We consider all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents.
Property, Plant and Equipment
Depreciation of property, plant and equipment (including equipment under capital leases) is computed based on the straight-line method over the following estimated useful lives of the assets: 
 
Years
Buildings and improvements
15 to 40
Furniture and fixtures
5 to 10
Machinery and equipment
3 to 15
Automobiles
5 to 70
Property, plant and equipment was comprised of the following at December 31, 2016 and 2017 (in thousands):
 
December 31, 2016
 
December 31, 2017
Land
$
73,744

 
$
74,981

Buildings and improvements
195,214

 
211,934

Furniture, equipment and automobiles
76,664

 
76,155

Property, plant and equipment, at cost
345,622

 
363,070

Less: accumulated depreciation
(110,509
)
 
(115,776
)
Property, plant and equipment, net
$
235,113

 
$
247,294

Schedule of Error Corrections
The effect of this adjustment on our Consolidated Balance Sheets as of December 31, 2016 and 2017 is as follows (dollars in thousands):
 
 
December 31, 2016
 
December 31, 2017
 
 
% Change
Increase in Deferred tax liability
$
2,255

5.6
%
 
7.8
%
Increase in Total liabilities
$
2,255

0.3
%
 
0.3
%
Decrease in Retained earnings
$
2,255

9.8
%
 
3.7
%
Decrease in Total stockholders' equity
$
2,255

1.3
%
 
1.1
%